.form-signin {
    width: 100%;
    max-width: 420px;
    padding: 15px;
    margin: auto;
    /*margin-top: 300px;*/
}

.form-control {
    display: block;
    width: 100%;
    height: calc(2.25rem + 2px);
    padding: .375rem .75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: .25rem;
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
}

:root {
    --input-padding-x: .75rem;
    --input-padding-y: .75rem;
}

html,
body {
    height: 100%;
}

body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #f5f5f5;
}

.form-signin {
    width: 100%;
    max-width: 420px;
    padding: 15px;
    margin: auto;
    /*margin-top: 300px;*/
}

.form-label-group {
    position: relative;
    margin-bottom: 1rem;
}

.form-label-group > input,
.form-label-group > label {
    padding: var(--input-padding-y) var(--input-padding-x);
}

.form-label-group > label {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    margin-bottom: 0; /* Override default `<label>` margin */
    line-height: 1.5;
    color: #495057;
    cursor: text; /* Match the input under the label */
    border: 1px solid transparent;
    border-radius: .25rem;
    transition: all .1s ease-in-out;
}

.form-label-group input::-webkit-input-placeholder {
    color: transparent;
}

.form-label-group input:-ms-input-placeholder {
    color: transparent;
}

.form-label-group input::-ms-input-placeholder {
    color: transparent;
}

.form-label-group input::-moz-placeholder {
    color: transparent;
}

.form-label-group input::placeholder {
    color: transparent;
}

.form-label-group input:not(:placeholder-shown) {
    padding-top: calc(var(--input-padding-y) + var(--input-padding-y) * (2 / 3));
    padding-bottom: calc(var(--input-padding-y) / 3);
}

.form-label-group input:not(:placeholder-shown) ~ label {
    padding-top: calc(var(--input-padding-y) / 3);
    padding-bottom: calc(var(--input-padding-y) / 3);
    font-size: 12px;
    color: #777;
}

/* Fallback for Edge
-------------------------------------------------- */
@supports (-ms-ime-align: auto) {
    .form-label-group > label {
        display: none;
    }

    .form-label-group input::-ms-input-placeholder {
        color: #777;
    }
}

/* Fallback for IE
-------------------------------------------------- */
@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
    .form-label-group > label {
        display: none;
    }

    .form-label-group input:-ms-input-placeholder {
        color: #777;
    }
}
